Download AKTU B-Tech 4th Sem 2014-15 Electromagenetic Field Theory Question Paper

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NEC404

(Following Paper ID and Roll No. to be filled in your Answer Book)

PAPER ID: 131407

Roll No.

B. Tech.

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(SEM. IV) THEORY EXAMINATION, 2014-15

ELECTROMAGNETIC FIELD THEORY (EMFT)

Time: 2 Hours]

[Total Marks: 50

1. Attempt any four questions. All parts carry equal marks. 3.5×4=14

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   1. State divergence theorem and Stoke's theorem.
   2. Explain the physical interpretation of curl.
   3. Convert the Cartesian coordinate system into cylindrical coordinate system.
   4. Transform the point P(1,1,6) in spherical coordinate system.
   5. Explain the gradient of a scalar field. Also explain its physical interpretation.

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   6. Write the Laplace equation in all three coordinate systems.

2. Attempt any two questions. All Question carry equal marks. 6×2=12

   1. Find the potential function and electric field intensity for the region between two concentric right circular cylinder where V=Vo at r=a and V=0 at r=b (b>a)?

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   2. Find the electric field intensity due to infinitely long charged wire (line charge).

   3. Derive Energy Density in electrostatic field.

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3. Attempt any two questions. All Question carry equal marks. 6×2=12

   1. Explain magnetic boundary conditions.

   2. State and explain Maxwell's equations in differential and integral form.

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   3. State and explain Biot-Savart law. Derive magnetic field intensity due to infinitely long wire carrying current I.

4. Attempt any two questions. All Question carry equal marks. 6×2=12

   1. Find the value of a, ß, for good conductors. Show that the angle of characteristic impedance is always 45° for good conductors.

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   2. Derive the mathematical expression for Poynting theorem.

   3. Find the expression for a, ß, ?, for lossless or perfect dielectric medium. A 10 GHZ plane wave traveling in free space has an amplitude of Ex=10 V/m. Find V, ?, ß, ? and the amplitude of H.

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